I tested on a Xenial system with no python2 installed;
only python3. I did this by first upgrading the ZFS packages and then
purging the python2 packages. All three scripts work as expected. I did
a basic run of each with no arguments.

For the record, in case anyone has this same concern... I'm not in love
with patching the scripts to use /usr/bin/python3, but that does seem to
be necessary. When I removed python2, there is no /usr/bin/python. I had
expected that the python3 package would use the alternatives mechanism
to register /usr/bin/python, but that does not seem to be the case.

Accordingly, I have marked this verification-done.

** Tags added: verification-done

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  [SRU] zfs-linux should be using python3 for python userspace tools

Status in zfs-linux package in Ubuntu:
  Fix Released
Status in zfs-linux source package in Xenial:
  Fix Committed
Status in zfs-linux source package in Yakkety:
  Fix Released

Bug description:

  dbufstat.py arc_summary.py arcstat.py should be using python3 rather than the 
older python2

  [Test case]
  running these ZFS helper tools should run with w/o python2 installed (and 
instead work with python3)

  [Regression potential]
  These helper scripts for checking ZFS state won't work if we regress. However 
it will not affect overall ZFS per se as these scripts are useful utilities and 
not part of the core ZFS functionality. Risk to ZFS core functionality on this 
SRU is therefore zero.

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